Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cdba7c44598235…

MALICIOUS

PDF

70.8 KB Authoring application: ImageMagick
MD5: 1831d20d1eaed7cbb1bd00e9c54b3105 SHA-1: 05339002bf3d664b3a134b60660d8e97bf28b3c3 SHA-256: 91cdba7c44598235a11cc76f6cd3fd28603072a8c4646361a1b1e98d439d8d50
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains and appear to be designed to direct users to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mywelby.org/uploads/1/3/0/5/130551775/7455381.pdf
    • http://pixbymitch.com/uploads/1/3/0/5/130546343/3039991.pdf
    • http://thatiphoneshow.com/uploads/1/3/0/4/130476458/gibomufabumer-kebatevusefe.pdf
    • https://tagulole.weebly.com/uploads/1/3/0/2/130271165/10c142e.pdf
    • http://allamericandogexpo.com/uploads/1/3/0/2/130287939/130287939.html#standing+barbell+military+press+form

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010b7.bin
cfe56e7e1eb51653a7476d54536c955b5861243f1bb9ab064abb87b1d3eb6d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7 8688 bytes

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